Crystallization Behavior of Long-Chain Branching Polylactide

The crystallization behavior of long-chain branched (LCB) poly(l-lactide) (PLLA), which were successfully prepared by successive functional group reactions, was studied by nonisothermal and isothermal methods in a wide temperature range. The density of the nuclei for LCB samples during crystallizati...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 2012-10, Vol.51 (42), p.13670-13679
Main Authors: Liu, Jianye, Zhang, Shijun, Zhang, Liying, Bai, Yiqing
Format: Article
Language:English
Subjects:
Applied sciences
Branched
Chains
Chemical engineering
Crystallization
Crystallization, leaching, miscellaneous separations
Density
Exact sciences and technology
Industrial engineering
Nucleation
Nuclei
Polylactides
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Summary:The crystallization behavior of long-chain branched (LCB) poly(l-lactide) (PLLA), which were successfully prepared by successive functional group reactions, was studied by nonisothermal and isothermal methods in a wide temperature range. The density of the nuclei for LCB samples during crystallization was much higher than that for linear PLLA. According to qualitative information about the chain topologies of the branched PLLAs, obtained by a combination of linear viscoelasticity and branch-on-branch (BOB) dynamic modeling, it should be the backbones of LCB that are able to act as nuclei and thus markedly enhance the crystallization rate of PLLA. Moreover, a kinetic analysis of crystallization was performed using secondary nucleation theory.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie301567n